Vapor chamber with unequal cross-sectional widths

ABSTRACT

A vapor chamber includes a case, an evaporation portion, a condensation portion, a transmission portion, and a working fluid. The case has a chamber. The evaporation portion, the condensation portion and the transmission portion are formed in different areas of the case. The evaporation portion has a first chamber room. The condensation portion has a second chamber room. A cross-sectional width of the second chamber room is less than a cross-sectional width of the first chamber room. The transmission portion is formed between the evaporation portion and the condensation portion. The transmission portion has a passage communicating with the first and the second chamber room. The passage has a first end adjacent to the evaporation portion and a second end adjacent to the condensation portion. A width of the first end is greater than a width of the second end. The working fluid is disposed in the chamber.

BACKGROUND Technical Field

The disclosure relates to a vapor chamber, particularly to a vaporchamber with unequal cross-sectional widths.

Related Art

With the uninterrupted increase of operational speed of electroniccomponents, the heat generated therefrom becomes higher and higher. Toeffectively solve the problem of high heat, the industry has widely usedvapor chambers with great thermo-conductivity. Because they possess awide heated area to be directly attached on a heat source for heatconduction, the arrangement of the peripheral devices can be simplified.Thus, vapor chambers are the mainstream of future development.

The related-art vapor chamber has a wide heated area, but the flow ofthe evaporated working fluid is so chaotic. That limits its performanceof heat dissipation. Usually, the related-art vapor chambers are of asimple geometric shape such as a square or a rectangle, so the fieldsand ranges of applications are considerably restricted. Also, inspecific circumstances, there are using demands of differentcross-sectional areas for vapor chambers. Such a vapor chamber withunequal cross-sectional areas has drawbacks of mutual interference andblock of flows of vaporized working fluid and liquid working fluid, soit is not developed yet.

In view of this, the inventors have devoted themselves to theabove-mentioned prior art, researched intensively and cooperated withthe application of science to try to solve the above-mentioned problems.

SUMMARY

An object of the disclosure is to provide a vapor chamber with unequalcross-sectional areas, which makes the evaporated working fluid slowlypass the passage and the liquid working fluid passing the passage befree from interfering by the evaporated working fluid to smoothly flowback to the evaporation portion.

To accomplish the above object, the disclosure provides a vapor chamberwith unequal cross-sectional areas, which includes a case, anevaporation portion, a condensation portion, a transmission portion, anda working fluid. The case has a chamber. The evaporation portion isformed in one part of the case and has a first chamber room in thechamber. The condensation portion is formed in another part of the caseand located on one side of the evaporation portion. The condensationportion has a second chamber room in the chamber. A cross-sectionalwidth of the second chamber room is less than a cross-sectional width ofthe first chamber room. The transmission portion is formed in the caseand between the evaporation portion and the condensation portion. Thetransmission portion has a passage communicating with the first chamberroom and the second chamber room in the chamber. The passage has a firstend adjacent to the evaporation portion and a second end adjacent to thecondensation portion. A width of the first end is greater than a widthof the second end. The working fluid is disposed in the chamber.

The disclosure further has the following functions. The shapearrangements of the partitions and the passage may reduce the passingspeed of evaporated working fluid. The unequal widths of the passage mayreduce the interference and block to the returning liquid working fluidwhen the evaporated working fluid passes the passage, and further avoiddry-out of the vapor chamber. The integration arrangement of the wickstructure may make the liquid working fluid be free from interruption ordiscontinuity during reflowing, and the reflowing amount may beincreased.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of the vapor chamber of the disclosure;

FIG. 2 is a see-through view of the vapor chamber of the disclosure;

FIG. 3 is a cross-sectional view of the vapor chamber of the disclosure;

FIG. 4 is a cross-sectional view of a cooler with the vapor chamber ofthe disclosure;

FIG. 5 is a cross-sectional view of FIG. 4 along another direction;

FIG. 6 is a cross-sectional view of a cooler with another embodiment ofthe vapor chamber of the disclosure; and

FIG. 7 is a cross-sectional view of still another embodiment of thevapor chamber of the disclosure.

DETAILED DESCRIPTION

The technical contents of this disclosure will become apparent with thedetailed description of embodiments accompanied with the illustration ofrelated drawings as follows. It is intended that the embodiments anddrawings disclosed herein are to be considered illustrative rather thanrestrictive.

Please refer to FIGS. 1-3 . The disclosure provides a vapor chamber withunequal cross-sectional areas, which includes a case 10, an evaporationportion 20, a condensation portion 30, a transmission portion 40 and aworking fluid 50.

The case 10 of the embodiment includes a lower shell 11 and an uppershell 12. The upper shell 12 and the lower shell 11 are made of amaterial with desired conductivity, such as copper, aluminum, magnesium,or an alloy thereof. Please further refer to FIG. 4 . The lower shell 11has a bottom plate 111, a lower surrounding wall 112 bended and extendedupward from a periphery of the bottom plate 111, and a lower sealingplate 113 horizontally extended from a periphery of the lowersurrounding wall 112. The upper shell 12 has a top plate 121, an uppersurrounding wall 122 bended and extended downward from the top plate121, and an upper sealing plate 123 horizontally extended from aperiphery of the upper surrounding wall 122. The upper shell 12correspondingly covers the lower shell 11. The upper sealing plate 123is correspondingly adhered to the lower sealing plate 113. A chamber Ais formed inside the upper shell 12 and the lower shell 11. Also, theinside surface of the top plate 121 are provided with multiple supportrods 124 spacedly for preventing both the top plate 121 and the bottomplate 111 from denting and deforming.

The evaporation portion 20 of the embodiment is substantially of aquadrilateral shape and formed in one part of the case 10. Theevaporation portion 20 has a first chamber room A1 in the chamber A.

The condensation portion 30 of the embodiment is substantially of aquadrilateral shape and formed in another part of the case 10. Thecondensation portion 30 has a second chamber room A2 in the chamber A. Across-sectional width W2 of the second chamber room A2 is less than across-sectional width W1 of the first chamber room A1. A baseline BL isdefined through the evaporation portion 20 and the condensation portion30. The baseline BL is a connecting line of centers of the first chamberroom A1 and the second chamber room A2. The cross-sectional widths W1,W2 are separately perpendicular to the baseline BL.

The transmission portion 40 of the embodiment is of a trapezoidal shapeand formed in the case 10 and between the evaporation portion 20 and thecondensation portion 30. The transmission portion 40 has a passage A3 inthe chamber A. The passage A3 communicates with the first chamber roomA1 and the second chamber room A2. The baseline BL also passes thecenter of the passage A3. The baseline BL may be a straight line or atype with partial curves as shown in FIG. 6 . The passage A3 has a firstend A31 and a second end A32. The first end A31 is arranged adjacent toan edge of the evaporation portion 20. The second end A32 is arrangedadjacent to an edge of the condensation portion 30. A width of the firstend A31 is greater than a width of the second end A32.

The working fluid 50 is disposed in the chamber A. The working fluid 50is a liquid which may generate gas-liquid phase transition, such as purewater, etc.

Furthermore, the vapor chamber 1 of the disclosure includes a wickstructure 60 laid on an inner surface of the bottom plate 111 of thelower shell 11. The wick structure 60 may be woven mesh, sintered metalpowder or fiber bundles for transmitting the liquid working fluid 50 bycapillary adsorption.

Furthermore, the vapor chamber 1 of the disclosure includes multiplepartitions 70. Each partition 70 is radially arranged in the passage A3.An interval width of any adjacent two of the partitions 70 at the firstend A31 is greater than an interval width of any adjacent two of thepartitions 70 at the second end A32 so as to make the evaporated workingfluid 50 be smoothly guided to enter the first end A31.

Please refer to FIGS. 4 and 5 . When the vapor chamber 1 of thedisclosure is applied to a heat dissipation device, the evaporationportion 20 is correspondingly attached on a heat source 8. An outersurface of the condensation portion 30 is provided with multiple coolingfins (heat dissipation sheets) 9. The heat generated from the heatsource 8 after operation is transferred to the evaporation portion 20 byconduction, the liquid working fluid 50 in the evaporation portion 20absorbs the heat to evaporate and changes to gaseous working fluid 50.The evaporated working fluid 50 carries a large amount of heat to passthe passage A3 and flows toward the condensation portion 30. By the heatdissipation action of the cooling fins 9 to the condensation portion 30,the condensation portion 30 stays at a lower temperature. When theevaporated working fluid 50 reaches the condensation portion 30, theevaporated working fluid 50 is condensed to the liquid working fluid 50.The liquid working fluid 50 is subject to the capillary suction of thewick structure 60 to flow along the passage A3 to return to theevaporation portion 20. The heat dissipation to the heat source 8 isaccomplished by the continuously circular operation.

Further, by the arrangement of the passage A3 and the partitions 70(according to the relation of Q=AV, wherein Q: flow rate, A:cross-sectional area and V: flow speed), the flow speed is inverselyproportional to the cross-sectional area, and a width of the first endA31 is greater than a width of the second end A32. In comparison with apassage with a straight cylindrical shape, the evaporated working fluid50 may pass the passage A3 with a slower speed so as to reduce theinterference and block to the returning liquid working fluid 50. Thatmay avoid dry-out of the vapor chamber 1.

Please refer to FIG. 6 . The vapor chamber 1A of the embodiment mayimplement a non-geometrical integration design such as FIG. 6 formultiple adjacent heat sources 8 or the using space of surroundings ofthe heat source 8 being restricted. The embodiment includes anevaporation portion 20, two condensation portions 30 and twotransmission portions 40. A cross-sectional width W2 of the secondchamber room A2 of each condensation portion 30 is less than across-sectional width W1 of the first chamber room A1 of the evaporationportion 20. Each transmission portion 40 is formed between theevaporation portion 20 and each condensation portion 30. Each passage A3communicates with the first chamber room A1 and each second chamber roomA2. In addition, each condensation portion 30 is provided with multiplecooling fins 9.

Please refer to FIG. 7 . The vapor chamber 1B of the embodiment differsfrom the above embodiments by the arrangement of the partitions 70. Eachpartition 70 may be arranged equidistantly in the passage A3.

While this disclosure has been described by means of specificembodiments, numerous modifications and variations could be made theretoby those skilled in the art without departing from the scope and spiritof this disclosure set forth in the claims.

What is claimed is:
 1. A vapor chamber comprising: a case, comprising achamber; an evaporation portion, disposed in one part of the case, andcomprising a first chamber room in the chamber; a condensation portion,disposed in another part of the case and located on one side theevaporation portion, comprising a second chamber room in the chamber,and a cross-sectional width of the second chamber room being less than across-sectional width of the first chamber room; a transmission portion,disposed in the case and between the evaporation portion and thecondensation portion, comprising a passage communicating with the firstchamber room and the second chamber room in the chamber, the passagecomprising a first end adjacent to the evaporation portion and a secondend adjacent to the condensation portion, and a width of the first endbeing greater than a width of the second end; and a working fluid,disposed in the chamber.
 2. The vapor chamber of claim 1, furthercomprising a wick structure, wherein the case comprises a lower shell,the lower shell comprises a bottom plate, and the wick structure is laidon the bottom plate.
 3. The vapor chamber of claim 2, further comprisingmultiple partitions, wherein each partition is arranged in the passageand located over the wick structure.
 4. The vapor chamber of claim 3,wherein each partition is radially arranged or equidistantly arranged.5. The vapor chamber of claim 1, further comprising multiple partitions,wherein each partition is arranged in the passage.
 6. The vapor chamberof claim 1, wherein a baseline is defined through the evaporationportion and the condensation portion, the baseline is a connecting lineof centers of the first chamber room and the second chamber room andpasses center of the passage, and the cross-sectional width of the firstchamber room and the cross-sectional width of the second chamber roomare separately perpendicular to the baseline.
 7. The vapor chamber ofclaim 1, wherein the transmission portion is of a trapezoidal shape. 8.The vapor chamber of claim 1, further comprising an another condensationportion and an another transmission portion, wherein the anothercondensation portion is disposed on another side of the evaporationportion, and the another transmission portion is disposed between theevaporation portion and the another condensation portion.
 9. The vaporchamber of claim 8, wherein the another condensation portion comprisesan another second chamber room in the chamber, and a cross-sectionalwidth of the another second chamber room is less than thecross-sectional width of the first chamber room.
 10. The vapor chamberof claim 9, wherein the another transmission portion comprises ananother passage communicating with the first chamber room and theanother second chamber room, the another passage comprises an anotherfirst end adjacent to the evaporation portion and an another second endadjacent to the another condensation portion, and a width of the anotherfirst end is greater than a width of the another second end.